A yellow foreground (text) on a red background separates the areas and provides a contrast in brightness, making a sign more legible. This color combination is always accessible.
"Hue" is the lightness or darkness of a color.
Avoid red and black color combinations whenever possible.
Usually, if something is legible in grayscale, then a color-blind person can view the information.
Everyone loves Christmas! Use Christmas colors, red and green, whenever possible.
White on black is readable in large font only.
Blue on white is accessible only in large text.
This statement is correct: Place an "X" inside of the yellow box.
Black and yellow is another combination which usually has a high contrast. Use this combination frequently.
Orange should be used ONLY with large text and as a highlight.
Bright colors such as magenta text on a blue background help people with color vision to read.
Because orange is neither very dark nor very light, it is easy on the eyes and transfers to grayscale well.
Red and white is indistinguishable from black and white.
When we talk about contrast ratio we are referring to the difference in value.
Reduce the afterimage effect from brightly colored hues, such as bright blue on pale pink, by making one of the colors a pastel or dark shade.